// Flex的复用
@mixin flex($hov:space-between, $ali:center){
  display: flex;
  justify-content:$hov;
  align-items:$ali;
}

@mixin bgImg($w:0, $h:0, $img:'',$size:contain){
  display: inline-block;
  width: $w;
  height: $h;
  background: url($img) no-repeat center;
  background-size: $size;
}
@mixin position($pos:absolute, $top:0,$left:0,$w:100%,$h:100%){
  position: $pos;
  top:$top;
  left:$left;
  width: $w;
  height: $h;
}

@mixin positionImg($pos:absolute,$top:0,$right:0,$w:0, $h:0, $img:''){
  position: $pos;
  top:$top;
  right:$right;
  width: $w;
  height: $h;
  background: url($img) no-repeat center;
  background-size: contain;
}